Diana, I'm so sorry to see this. You have my prayers of support for you going up now. Really, it sounds like you've "served your time" and done what you can for your children, now that they're grown and out of the house I think if you've found the need to make this decision, it's certainly the right one for you. God gave us the flight instinct for a reason, and I've seen friends destroyed by the evils of addiction. Sadly, despite the amount of interdiction, most cases ended tragically.
Again, so sorry to see this. I really hope you build a much happier new life free of the pain that's been inflicted on you.